<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
<style>
		div{
	width:300px;
	height:600px;
	border:1px solid red;
	border-right:300px solid black;
	border-radius:300px;
}
div::before{
	content:'';
	display:block;
	width:100px;
	height:100px;
	border:100px solid black;
	background:white;
	border-radius:150px;
	margin-left:150px;
}
div::after{
	content:'';
	display:block;
	width:100px;
	height:100px;
	border:100px solid white;
	background:black;
	margin-left:150px;
	border-radius:150px;
}
a{
	position:absolute; position:absolute;position:absolute;position:absolute;position:absolute;position:absolute;position:absolute;position:absolute;position:absolute;position:absolute;position:absolute;position:absolute;
overflow:none;

}
</style>
</head>
<body>
	<div></div>
</body>
</html>